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Compact beige circuit breaker with black paddle actuator and silver lug terminals

SQUARE D

SQUARE D HOM140 Miniature Circuit Breaker HOMELINE 40A 1 Pole 120V

SKU CH-SDB7-R3MST

A 40 A, single-pole plug-in breaker rated 120 V AC with a 10 kA interrupting capacity for Homeline load centres

  • 40 A single-pole protection for 120 V residential circuits
  • 10 kA interrupting rating clears faults safely
  • Plug-in mounting fits Homeline load centers quickly
  • Lug terminals accept standard copper conductors
  • Compact 3.13 in frame saves panel space

40 A Single-Pole Breaker for Homeline Load Centres

This Square D Homeline miniature circuit breaker provides 40 A overcurrent protection on a 120 V AC single-phase circuit. It uses a plug-in mounting style that fits directly into compatible Homeline load centres. The paddle actuator gives clear on and off indication. It is rated for a maximum interrupting capacity of 10 kA at 120 V AC.

Plug-In Mounting Limits and Voltage Scope

The breaker only accepts plug-in installation in Homeline-series panels and cannot be used in bolt-on or other manufacturers' load centres. Its AC voltage rating is 120 V and it carries no DC rating, so it must not be applied to DC circuits. The 10 kA interrupting rating defines the maximum prospective fault current it can safely clear at 120 V AC. Operating temperature minimum is 77 °F.

Replaces Standard 1-Pole 40 A Homeline Breakers

This unit replaces an existing 1-pole 40 A Homeline breaker that has tripped repeatedly, shows physical damage or no longer resets. The upgrade is worth it when the panel is a Homeline series and the circuit requires 40 A at 120 V AC with 10 kA interrupting capacity. It does not add poles, increase amperage or provide DC protection.

How it compares

Measured against everything we stock in Breakers & Circuit Protection, at today’s prices. Recalculated every night.

Price $9.99
Cheaper than about 93% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameSQUARE D

Questions about this item

Should I pick a 40 A single-pole breaker or a different amperage for my Homeline panel?

Choose the 40 A single-pole version when the circuit it protects is rated for 40 amps; other amperages exist but must match the wire size and load calculation for that branch.

What does the 10 kA rating mean once the breaker is installed in my load centre?

It means the breaker can safely interrupt up to 10 000 amps of fault current at 120 V AC, which covers typical residential short-circuit levels.

Will this plug-in breaker work with any 120 V panel or only Homeline load centres?

It is designed exclusively for Homeline series load centres; the plug-in mounting and lug terminals will not fit other panel brands.

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